Saint Flavia Domitilla is a saint in the Greek Orthodox Church, which celebrates her feast day on 12 May. And also as a saint by the Roman Catholic Church, which honoured her on 12 May together with Saints Nereus and Achilleus, in whose church of Santi Nereo e Achilleo in Rome, her supposed relics were housed. Her name was not linked with theirs in the Tridentine Calendar of Pope Pius V. It was added in 1595, and was removed from that date in 1969, and is now listed on 7 May in the Martyrology. Eusebius of Caesarea, the acts of Nereus and Achilles, and St. Jerome represent Flavia Domitilla as the niece, not the wife of the consul Flavius Clemens, and say that her place of exile was Pontia (now Ponza), an island also situated in the Tyrrhenian Sea. These statements have given rise to the opinion that there were two Domitillas (aunt and niece) who were Christians, and latter generally referred to as Flavia Domitilla the Younger. Lightfoot has shown that this opinion, adopted by Tillemont and De Rossi and still maintained by many writers (among them Allard and Duchesne), is derived entirely from Eusebius who was led into this error by mistakes in transcription, or ambiguity of expression, in the sources which he used. He mentions only the conversion of Domitilla, saying that she was the daughter of Clemens' sister, and that she was deported to the island of Pontia (compare also his "Chronicle," year 98). The Tridentine Calendar had on 12 May a joint feast (semidouble rank) of Nereus, Achilleus and Pancras. The name of Domitilla was added in 1595. The joint celebration of Nereus, Achilleus, Domitilla and Pancras continued with that ranking (see General Roman Calendar of 1954) until the revision of 1960, when it was reclassified as a third-class feast (see General Roman Calendar of 1960). In the present General Roman Calendar, revised in 1969, Saints Nereus and Achilleus (together) and Saint Pancras have distinct celebrations (optional memorials) on 12 May. Saint Domitilla is not included in the revised calendar, because the liturgical honours once paid to her "have no basis in tradition".